JP5847030B2 - Exhaust throttle valve control device and exhaust throttle valve control method - Google Patents

Exhaust throttle valve control device and exhaust throttle valve control method Download PDF

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JP5847030B2
JP5847030B2 JP2012147018A JP2012147018A JP5847030B2 JP 5847030 B2 JP5847030 B2 JP 5847030B2 JP 2012147018 A JP2012147018 A JP 2012147018A JP 2012147018 A JP2012147018 A JP 2012147018A JP 5847030 B2 JP5847030 B2 JP 5847030B2
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throttle valve
exhaust throttle
opening
learning
control
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JP2014009635A (en
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光夫 小川
光夫 小川
吉岡　衛
衛 吉岡
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Aisan Industry Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/12—Introducing corrections for particular operating conditions for deceleration
    • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2438—Active learning methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/16—End position calibration, i.e. calculation or measurement of actuator end positions, e.g. for throttle or its driving actuator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Description

この発明は、エンジンシステムの排気系に設けられ排気の流れを制限する排気絞り弁の制御装置および排気絞り弁の制御方法に関する。   The present invention relates to an exhaust throttle valve control device and an exhaust throttle valve control method that are provided in an exhaust system of an engine system and limit an exhaust flow.

ＬＰＬ−ＥＧＲシステムを備えるエンジンシステム（内燃機関システム）においては、排気系に設けられ排気の流れを制限する排気絞り弁により、背圧制御（ＥＧＲ制御）を実施している。そして、排気絞り弁はモータにより開閉弁を行っているが、モータは全閉位置を基準として駆動する。そのため、排気絞り弁の全閉位置のずれによる排気の流量変化を防いで背圧制御を精度良く実施する為に、全閉位置を確認する全閉学習を行うことが必要である。なお、ＬＰＬ−ＥＧＲシステムとは、過給機のタービンの下流側からコンプレッサの上流側へＥＧＲガスを還流させるシステムである。   In an engine system (internal combustion engine system) including an LPL-EGR system, back pressure control (EGR control) is performed by an exhaust throttle valve that is provided in the exhaust system and restricts the flow of exhaust gas. The exhaust throttle valve is opened and closed by a motor, and the motor is driven based on the fully closed position. For this reason, it is necessary to perform full-close learning for confirming the full-closed position in order to prevent the exhaust flow rate from being changed due to the displacement of the full-closed position of the exhaust throttle valve and to accurately perform the back pressure control. The LPL-EGR system is a system that recirculates EGR gas from the downstream side of the turbocharger turbine to the upstream side of the compressor.

ここで、制御弁の全閉学習を行う技術として、特許文献１の技術が存在する。この特許文献１の技術は、電動弁の開閉制御装置において、全閉パルスを出力して制御弁の全閉状態で開度基準位置を設定して全閉学習を行い、開弁信号が出力されたら設定開度まで開弁するというものである。   Here, there is a technique disclosed in Patent Document 1 as a technique for performing fully closed learning of the control valve. In the technique of this patent document 1, in the open / close control device for an electric valve, a fully-closed pulse is output, the opening reference position is set in the fully-closed state of the control valve, and the fully-closed learning is performed, and a valve-opening signal is output. Then, the valve is opened to the set opening.

特開平２−１７２７８号公報Japanese Patent Laid-Open No. 2-17278

しかしながら、前記のエンジンシステムの排気絞り弁において、特許文献１の技術のような全閉学習をエンジン（内燃機関）の停止時に行うと、運転者は排気絞り弁のモータの作動音が聞こえて違和感を覚えてしまう。また、モータの作動音は車外にも聞こえるので、特にガレージなどに車両を保管する場合に異音が発生して問題となる。そこで、モータの作動音を消音するために大規模な消音装置を設けることが考えられるが、コストが増大してしまうとともに、大規模な消音装置を車両内の限られたスペースに搭載するのは非常に困難である。また、全閉学習後に背圧上昇下で排気絞り弁を開弁すると大きな圧力開放音が発生してしまうので、運転者などはこの圧力開放音が聞こえることによっても違和感を覚えてしまう。   However, in the exhaust throttle valve of the engine system, when the fully closed learning as in the technique of Patent Document 1 is performed when the engine (internal combustion engine) is stopped, the driver hears the operation sound of the exhaust throttle valve motor and feels uncomfortable. I remember. Further, since the operation sound of the motor can be heard outside the vehicle, an abnormal noise is generated particularly when the vehicle is stored in a garage or the like. Therefore, it is conceivable to provide a large-scale silencer to mute the operating noise of the motor, but the cost increases, and installing a large-scale silencer in a limited space in the vehicle It is very difficult. In addition, if the exhaust throttle valve is opened with the back pressure rising after learning to fully close, a large pressure release sound is generated, so that the driver feels uncomfortable even when the pressure release sound is heard.

そこで、本発明は上記した問題点を解決するためになされたものであり、開閉弁を行うモータの作動音による違和感を解消しながら排気絞り弁の全閉学習を行うことができる排気絞り弁の制御装置および排気絞り弁の制御方法を提供すること、を課題とする。   Accordingly, the present invention has been made to solve the above-described problems, and is an exhaust throttle valve that can perform fully closed learning of the exhaust throttle valve while eliminating the uncomfortable feeling caused by the operating sound of the motor that performs the on-off valve. It is an object of the present invention to provide a control device and an exhaust throttle valve control method.

上記課題を解決するためになされた本発明の一態様は、内燃機関に接続する排気通路に設けられ開弁状態にて所定の通常速度で開閉弁して排気の流れを制限する排気絞り弁の制御装置において、前記内燃機関を搭載する車両のアクセル開度が０％であり、かつ、前記内燃機関にてフューエルカットが行われ、かつ、前記内燃機関の回転数が所定の範囲内である条件を満たすときに、前記排気絞り弁を強制的に全閉して前記排気絞り弁の全閉位置を学習する全閉学習を行う全閉学習制御手段を有し、前記全閉学習制御手段は、前記全閉学習を完了した後に、前記通常速度よりも遅い徐開速度により前記排気絞り弁を開弁する徐開弁制御を行って前記排気絞り弁を前記アクセル開度が０％のときの目標開度に制御すること、を特徴とする。 One aspect of the present invention made to solve the above problems is an exhaust throttle valve that is provided in an exhaust passage connected to an internal combustion engine and that opens and closes at a predetermined normal speed in a valve-open state to restrict the flow of exhaust. In the control device, a condition in which an accelerator opening degree of a vehicle on which the internal combustion engine is mounted is 0%, fuel cut is performed in the internal combustion engine, and the rotational speed of the internal combustion engine is within a predetermined range. when satisfying, have a fully closed learning control means for fully closing learning for learning the fully closed position of the exhaust throttle valve forcibly fully closed the exhaust throttle valve, the fully closed learning control means, After the completion of the full-close learning, a slow opening control is performed to open the exhaust throttle valve at a slow opening speed slower than the normal speed, and the exhaust throttle valve is set to a target when the accelerator opening is 0%. It is characterized by controlling the opening .

この態様によれば、内燃機関の運転時に排気絞り弁の全閉学習を行うので、排気絞り弁の開閉弁を行うモータの作動音は、内燃機関が発する音またはロードノイズなどにより打ち消される。そのため、排気絞り弁の開閉弁を行うモータの作動音による違和感を解消しながら、排気絞り弁の全閉学習を行うことができる。   According to this aspect, since the exhaust throttle valve fully closed learning is performed during operation of the internal combustion engine, the operating sound of the motor that opens and closes the exhaust throttle valve is canceled by the sound generated by the internal combustion engine or road noise. Therefore, the exhaust throttle valve fully closed learning can be performed while eliminating the sense of incongruity caused by the operating sound of the motor that opens and closes the exhaust throttle valve.

また、車両のアクセル開度が０％であり、かつ、フューエルカットが行われ、かつ、内燃機関の回転数が所定の範囲内である条件下にて排気絞り弁の全閉学習を行うので、吸入空気量を抑制して、背圧（内燃機関の排気側の圧力）の上昇を抑制できる。そのため、内燃機関における燃焼状態が不安定になることを防ぎ、エンスト（エンジンストール）を防止できる。さらに、全閉学習を完了した後に排気絞り弁を速度を遅くして開弁するので、排気絞り弁の圧力開放音を抑制できる。そのため、全閉学習を完了した後において、排気絞り弁の圧力開放音による違和感を解消できる。 In addition, since the accelerator opening of the vehicle is 0%, fuel cut is performed, and the exhaust throttle valve is fully closed under the condition that the rotational speed of the internal combustion engine is within a predetermined range, It is possible to suppress the increase in back pressure (pressure on the exhaust side of the internal combustion engine) by suppressing the intake air amount. Therefore, the combustion state in the internal combustion engine can be prevented from becoming unstable, and engine stall can be prevented. Furthermore, since the exhaust throttle valve is opened at a lower speed after completing the fully closed learning, the pressure release noise of the exhaust throttle valve can be suppressed. For this reason, after completing the fully closed learning, it is possible to eliminate the uncomfortable feeling caused by the pressure release sound of the exhaust throttle valve.

上記の態様においては、前記全閉学習制御手段は、前記全閉学習の途中で前記フューエルカットが終了されたとき、または、前記全閉学習の途中で前記内燃機関の回転数が前記所定の範囲外となったときに、前記全閉学習を中断すること、を特徴とする。   In the above aspect, the full-close learning control means is configured such that the rotational speed of the internal combustion engine is within the predetermined range when the fuel cut is completed during the full-close learning or during the full-close learning. The fully-closed learning is interrupted when it becomes outside.

この態様によれば、背圧の上昇を抑制することができる。   According to this aspect, an increase in back pressure can be suppressed.

上記の態様においては、前記全閉学習制御手段は、前記全閉学習を中断した後に、前記通常速度よりも遅い徐開速度により前記排気絞り弁を開弁する徐開弁制御を行って前記排気絞り弁を前記アクセル開度が０％のときの目標開度に制御すること、が好ましい。   In the above aspect, the full-close learning control means performs the slow-open valve control for opening the exhaust throttle valve at a slow-open speed that is slower than the normal speed after interrupting the full-close learning and performing the exhaust valve control. It is preferable to control the throttle valve to a target opening when the accelerator opening is 0%.

この態様によれば、全閉学習を中断した後に排気絞り弁を速度を遅くして開弁するので、排気絞り弁の圧力開放音を抑制できる。そのため、全閉学習を中断した後において、排気絞り弁の圧力開放音による違和感を解消できる。   According to this aspect, since the exhaust throttle valve is opened at a reduced speed after interrupting the fully closed learning, the pressure release sound of the exhaust throttle valve can be suppressed. Therefore, it is possible to eliminate the uncomfortable feeling caused by the pressure release sound of the exhaust throttle valve after interrupting the fully closed learning.

上記の態様においては、前記全閉学習制御手段は、前記徐開弁制御を行って前記排気絞り弁を前記アクセル開度が０％のときの目標開度に制御した後、前記通常速度により前記排気絞り弁を開弁する通常開弁制御を行って前記排気絞り弁を前記アクセル開度に応じた目標開度に制御すること、が好ましい。   In the above aspect, the full-close learning control means performs the gradual opening valve control to control the exhaust throttle valve to a target opening when the accelerator opening is 0%, and then the normal speed It is preferable to perform normal valve opening control for opening the exhaust throttle valve to control the exhaust throttle valve to a target opening degree corresponding to the accelerator opening degree.

この態様によれば、圧力開放音を抑制しながら排気絞り弁を開弁した後、排気絞り弁をアクセル開度に応じて規定される目標開度まで確実に開弁することができる。そのため、排気絞り弁の圧力開放音の違和感を解消しながら、運転者の意思に沿った車両の走行を行うことができる。   According to this aspect, after the exhaust throttle valve is opened while suppressing the pressure release noise, the exhaust throttle valve can be reliably opened to the target opening degree that is defined according to the accelerator opening degree. Therefore, the vehicle can be driven in accordance with the driver's intention while eliminating the uncomfortable feeling of the pressure release sound of the exhaust throttle valve.

上記の態様においては、前記全閉学習制御手段は、前記全閉学習の途中で前記アクセル開度が増加したことにより前記フューエルカットが終了されて前記全閉学習を中断したとき、または、前記全閉学習の途中で前記内燃機関の回転数が前記所定の範囲外に低下して、前記所定の範囲外における所定の回転数以下になったことにより前記全閉学習を中断したときは、前記全閉学習を中断した後に、前記通常速度よりも速い急開速度により前記排気絞り弁を開弁する急開弁制御を行って前記排気絞り弁を前記アクセル開度に応じた目標開度に制御すること、が好ましい。   In the above aspect, the full-close learning control means is configured to stop the full-close learning when the fuel cut is terminated due to an increase in the accelerator opening during the full-close learning, or when the full-close learning is interrupted. When the full-closed learning is interrupted because the rotational speed of the internal combustion engine falls outside the predetermined range during the closing learning and becomes equal to or lower than the predetermined rotational speed outside the predetermined range, After interrupting the closing learning, the exhaust throttle valve is opened at a rapid opening speed higher than the normal speed, and the exhaust throttle valve is controlled to a target opening degree corresponding to the accelerator opening degree. It is preferable.

この態様によれば、車両が急加速するときに、背圧が急激に上昇することを抑制でき、エンストを防止できる。また、内燃機関の回転数が急低下するときにも、エンストを防止できる。   According to this aspect, when the vehicle suddenly accelerates, the back pressure can be prevented from increasing rapidly, and engine stall can be prevented. In addition, engine stall can be prevented even when the rotational speed of the internal combustion engine suddenly decreases.

上記課題を解決するためになされた本発明の他の態様は、内燃機関に接続する排気通路に設けられ開弁状態にて所定の通常速度で開閉弁して排気の流れを制限する排気絞り弁の制御方法において、前記内燃機関を搭載する車両のアクセル開度が０％であり、かつ、前記内燃機関にてフューエルカットが行われ、かつ、前記内燃機関の回転数が所定の範囲内である条件を満たすときに、前記排気絞り弁を強制的に全閉して前記排気絞り弁の全閉位置を学習する全閉学習を行い、前記全閉学習を完了した後に、前記通常速度よりも遅い徐開速度により前記排気絞り弁を開弁する徐開弁制御を行って前記排気絞り弁を前記アクセル開度が０％のときの目標開度に制御すること、を特徴とする。 Another aspect of the present invention made to solve the above problems is an exhaust throttle valve which is provided in an exhaust passage connected to an internal combustion engine and which opens and closes at a predetermined normal speed in a valve open state to restrict the flow of exhaust. In this control method, the accelerator opening degree of the vehicle equipped with the internal combustion engine is 0%, fuel cut is performed in the internal combustion engine, and the rotational speed of the internal combustion engine is within a predetermined range. when conditions are satisfied, have rows fully closed learning for learning the fully closed position of the forced fully closed by the exhaust throttle valve the exhaust throttle valve, wherein after completing the fully closed learning, than the normal speed The exhaust throttle valve is controlled to a target opening degree when the accelerator opening degree is 0% by performing a slow opening valve control that opens the exhaust throttle valve at a slow slow opening speed .

この態様によれば、内燃機関の運転時に排気絞り弁の全閉学習を行うので、排気絞り弁の開閉弁を行うモータの作動音は、内燃機関が発する音またはロードノイズなどにより打ち消される。そのため、排気絞り弁の開閉弁を行うモータの作動音による違和感を解消しながら、排気絞り弁の全閉学習を行うことができる。   According to this aspect, since the exhaust throttle valve fully closed learning is performed during operation of the internal combustion engine, the operating sound of the motor that opens and closes the exhaust throttle valve is canceled by the sound generated by the internal combustion engine or road noise. Therefore, the exhaust throttle valve fully closed learning can be performed while eliminating the sense of incongruity caused by the operating sound of the motor that opens and closes the exhaust throttle valve.

また、車両のアクセル開度が０％であり、かつ、フューエルカットが行われ、かつ、内燃機関の回転数が所定の範囲内である条件下にて排気絞り弁の全閉学習を行うので、吸入空気量を抑制して、背圧の上昇を抑制できる。そのため、内燃機関における燃焼状態が不安定になることを防ぎ、エンストを防止できる。さらに、全閉学習を完了した後に排気絞り弁を速度を遅くして開弁するので、排気絞り弁の圧力開放音を抑制できる。そのため、全閉学習を完了した後において、排気絞り弁の圧力開放音による違和感を解消できる。 In addition, since the accelerator opening of the vehicle is 0%, fuel cut is performed, and the exhaust throttle valve is fully closed under the condition that the rotational speed of the internal combustion engine is within a predetermined range, By suppressing the amount of intake air, it is possible to suppress an increase in back pressure. Therefore, the combustion state in the internal combustion engine can be prevented from becoming unstable, and engine stall can be prevented. Furthermore, since the exhaust throttle valve is opened at a lower speed after completing the fully closed learning, the pressure release noise of the exhaust throttle valve can be suppressed. For this reason, after completing the fully closed learning, it is possible to eliminate the uncomfortable feeling caused by the pressure release sound of the exhaust throttle valve.

本発明に係る排気絞り弁の制御装置および排気絞り弁の制御方法によれば、開閉弁を行うモータの作動音による違和感を解消しながら排気絞り弁の全閉学習を行うことができる。   According to the exhaust throttle valve control device and the exhaust throttle valve control method of the present invention, it is possible to perform the exhaust throttle valve fully closed learning while eliminating the uncomfortable feeling caused by the operating sound of the motor that performs the on-off valve.

エンジンシステムの全体構成図である。1 is an overall configuration diagram of an engine system. 通常開弁制御と徐開弁制御と急開弁制御のそれぞれにおける開弁速度の様子を示す図である。It is a figure which shows the mode of the valve opening speed in each of normal valve-opening control, slow valve-opening control, and rapid valve-opening control. 排気絞り弁全閉学習制御ルーチンを示す図である。It is a figure which shows an exhaust throttle valve full closing learning control routine. 排気絞り弁の目標開度マップの一例を示す図である。It is a figure which shows an example of the target opening degree map of an exhaust throttle valve. 通常の排気絞り弁制御ルーチンを示す図である。It is a figure which shows a normal exhaust throttle valve control routine. エンジン回転数とアクセル開度とフューエルカットのＯＮ・ＯＦＦと排気絞り弁の開度と全閉開弁復帰徐開制御フラグのタイムチャートの一例を示す図である。It is a figure which shows an example of a time chart of an engine speed, an accelerator opening degree, ON / OFF of a fuel cut, an opening degree of an exhaust throttle valve, and a fully-closed valve opening / returning slow opening control flag. エンジン回転数とアクセル開度とフューエルカットのＯＮ・ＯＦＦと排気絞り弁の開度と全閉開弁復帰徐開制御フラグのタイムチャートの他の例を示す図である。It is a figure which shows the other example of a time chart of an engine speed, an accelerator opening degree, ON / OFF of a fuel cut, the opening degree of an exhaust throttle valve, and a fully-closed valve-opening return slow open control flag. エンジン回転数とアクセル開度とフューエルカットのＯＮ・ＯＦＦと排気絞り弁の開度と全閉開弁復帰徐開制御フラグのタイムチャートの他の例を示す図である。It is a figure which shows the other example of a time chart of an engine speed, an accelerator opening degree, ON / OFF of a fuel cut, the opening degree of an exhaust throttle valve, and a fully-closed valve-opening return slow open control flag.

〔エンジンシステムの構成〕
以下、本発明に係る排気絞り弁の制御装置を具体化したエンジンシステム（内燃機関システム）の実施例について、図面を参照しながら説明する。 [Engine system configuration]
Hereinafter, an embodiment of an engine system (internal combustion engine system) that embodies an exhaust throttle valve control device according to the present invention will be described with reference to the drawings.

まず、エンジンシステム１の全体構成について、図１を参照しながら説明する。図１は、エンジンシステム１を示す全体構成図である。なお、図１においては、エンジンシステム１として、ディーゼルエンジンシステムを一例として示している。   First, the overall configuration of the engine system 1 will be described with reference to FIG. FIG. 1 is an overall configuration diagram showing an engine system 1. In FIG. 1, a diesel engine system is shown as an example as the engine system 1.

エンジンシステム１は、図１に示すように、主に、ＥＣＵ１０と、エアフィルタ１２と、吸気通路１４と、過給機１６と、インタークーラ１８と、ディーゼルスロットル２０と、エンジン（内燃機関）２２と、排気通路２４と、ＤＰＦ２６と、マフラ２８と、ＥＧＲ通路３０と、ＥＧＲバルブ３２と、ＬＰＬ−ＥＧＲシステム３４と、触媒３６などを有する。なお、ＬＰＬ−ＥＧＲシステム３４は、詳しくは後述するように、排気絞り弁３８を備えている。また、ＥＣＵ１０は、本発明における「排気絞り弁の制御装置」に相当する。   As shown in FIG. 1, the engine system 1 mainly includes an ECU 10, an air filter 12, an intake passage 14, a supercharger 16, an intercooler 18, a diesel throttle 20, and an engine (internal combustion engine) 22. And an exhaust passage 24, a DPF 26, a muffler 28, an EGR passage 30, an EGR valve 32, an LPL-EGR system 34, a catalyst 36, and the like. The LPL-EGR system 34 includes an exhaust throttle valve 38 as will be described in detail later. The ECU 10 corresponds to an “exhaust throttle control device” in the present invention.

ＥＣＵ１０は、エンジンシステム１に備わる各部位の電子制御を司るマイクロコンピュータ（マイコン）を備えている。このマイコンは、周知のように中央処理装置（ＣＰＵ）、読み出し書き換えメモリ（ＲＡＭ）、読み出し専用メモリ（ＲＯＭ）等を備え、ＥＣＵ１０に入力された信号の処理等を行うものである。このＥＣＵ１０は、詳しくは後述するように排気絞り弁３８も制御する。   The ECU 10 includes a microcomputer that performs electronic control of each part provided in the engine system 1. As is well known, the microcomputer includes a central processing unit (CPU), a read / write memory (RAM), a read only memory (ROM), and the like, and performs processing of signals input to the ECU 10 and the like. The ECU 10 also controls the exhaust throttle valve 38 as will be described in detail later.

また、ＥＣＵ１０は、各種センサ及びスイッチ等に接続されており、例えば、アクセル開度センサ４０からのアクセル踏込量、回転数センサ４２からのエンジン回転数、排気絞り弁３８に備わる弁開度センサ４４からの排気絞り弁３８の開度などを入力として受け取るようになっている。なお、ＥＣＵ１０は、本発明における「全閉学習制御手段」を兼ねている。   The ECU 10 is connected to various sensors, switches, and the like. For example, the accelerator depression amount from the accelerator opening sensor 40, the engine speed from the rotation speed sensor 42, and the valve opening sensor 44 provided in the exhaust throttle valve 38. The opening of the exhaust throttle valve 38 is received as an input. The ECU 10 also serves as the “fully closed learning control unit” in the present invention.

エアフィルタ１２は、外部から取得されたエア（空気、吸気）を浄化して、吸気通路１４に供給する。また、過給機１６は、コンプレッサ４６と、タービン４８と、を備える。コンプレッサ４６は吸気通路１４に設けられ、タービン４８は排気通路２４に設けられている。また、インタークーラ１８は、吸気通路１４に設けられ、コンプレッサ４６により昇圧された吸気を適温に冷却する。   The air filter 12 purifies air (air, intake air) acquired from the outside and supplies it to the intake passage 14. The supercharger 16 includes a compressor 46 and a turbine 48. The compressor 46 is provided in the intake passage 14, and the turbine 48 is provided in the exhaust passage 24. Further, the intercooler 18 is provided in the intake passage 14 and cools the intake air boosted by the compressor 46 to an appropriate temperature.

ディーゼルスロットル２０は、吸気通路１４に接続されるＥＧＲ通路３０の接続口とコンプレッサ４６との間に配置され、バルブ開度に応じてエンジン２２に吸入される空気量を調節する。   The diesel throttle 20 is disposed between the connection port of the EGR passage 30 connected to the intake passage 14 and the compressor 46, and adjusts the amount of air taken into the engine 22 according to the valve opening.

ＤＰＦ２６は、排気通路２４に設けられ、排気中のＰＭ（Particulate Matter：粒子状物質）を捕捉する。マフラ２８は、排気通路２４に設けられ、排気音を消音する。   The DPF 26 is provided in the exhaust passage 24 and captures PM (Particulate Matter) in the exhaust. The muffler 28 is provided in the exhaust passage 24 and silences the exhaust sound.

ＥＧＲ通路３０は、一端が排気通路２４に接続されており、他端が吸気通路１４に接続されている。このＥＧＲ通路３０は、排気（ＥＧＲガス）を吸気系に還流するための通路である。ＥＧＲバルブ３２は、ＥＧＲ通路３０を通過するＥＧＲガスの流量を調節する弁であり、吸気系に還流させるＥＧＲガスの量を調節する弁である。   The EGR passage 30 has one end connected to the exhaust passage 24 and the other end connected to the intake passage 14. The EGR passage 30 is a passage for returning exhaust gas (EGR gas) to the intake system. The EGR valve 32 is a valve that adjusts the flow rate of EGR gas that passes through the EGR passage 30, and is a valve that adjusts the amount of EGR gas that is recirculated to the intake system.

ＬＰＬ−ＥＧＲシステム３４は、過給機１６のタービン４８の下流側からコンプレッサ４６の上流側へＥＧＲガスを還流させるシステムである。このＬＰＬ−ＥＧＲシステム３４は、主に、排気絞り弁３８と、ＥＧＲ通路５０と、ＥＧＲクーラ５２と、ＥＧＲバルブ５４とを備える。   The LPL-EGR system 34 is a system that recirculates EGR gas from the downstream side of the turbine 48 of the supercharger 16 to the upstream side of the compressor 46. The LPL-EGR system 34 mainly includes an exhaust throttle valve 38, an EGR passage 50, an EGR cooler 52, and an EGR valve 54.

排気絞り弁３８は、エンジン２２に接続する排気通路２４に設けられており、車両の通常の走行時などにおいて、開弁状態にて所定の通常速度で開閉弁して開度を制御しながら排気の流れを制限する。この排気絞り弁３８は、不図示のモータを備えており、ＥＣＵ１０からの指示によりモータを駆動して開閉弁する。また、排気絞り弁３８は、前記の弁開度センサ４４も備えている。この排気絞り弁３８は、ＥＧＲクーラ５２やＥＧＲバルブ５４に効率良く排気を導く。   The exhaust throttle valve 38 is provided in the exhaust passage 24 connected to the engine 22. When the vehicle is traveling normally, the exhaust throttle valve 38 opens and closes at a predetermined normal speed in the valve open state and controls the opening while controlling the opening degree. Restrict the flow of The exhaust throttle valve 38 includes a motor (not shown), and opens and closes by driving the motor according to an instruction from the ECU 10. The exhaust throttle valve 38 also includes the valve opening sensor 44 described above. The exhaust throttle valve 38 efficiently guides exhaust to the EGR cooler 52 and the EGR valve 54.

ＥＧＲ通路５０は、一端が排気通路２４における過給機１６のタービン４８の下流側に接続されており、他端が吸気通路１４における過給機１６のコンプレッサ４６の上流側に接続されている。このＥＧＲ通路５０は、排気（ＥＧＲガス）を吸気系に還流するための通路である。具体的には、ＥＧＲ通路５０には、ＥＧＲクーラ５２と、ＥＧＲバルブ５４が設けられている。ＥＧＲクーラ５２は、ＥＧＲガスを冷却する装置である。ＥＧＲバルブ５４は、ＥＧＲ通路５０を通過するＥＧＲガスの流量を調節する弁であり、吸気系に還流させるＥＧＲガスの量を調節する弁である。   One end of the EGR passage 50 is connected to the downstream side of the turbine 48 of the supercharger 16 in the exhaust passage 24, and the other end is connected to the upstream side of the compressor 46 of the supercharger 16 in the intake passage 14. The EGR passage 50 is a passage for returning exhaust gas (EGR gas) to the intake system. Specifically, an EGR cooler 52 and an EGR valve 54 are provided in the EGR passage 50. The EGR cooler 52 is a device that cools the EGR gas. The EGR valve 54 is a valve that adjusts the flow rate of the EGR gas that passes through the EGR passage 50, and is a valve that adjusts the amount of EGR gas that is recirculated to the intake system.

以上が、エンジンシステム１の構成の説明である。   The above is the description of the configuration of the engine system 1.

〔排気絞り弁の制御装置の作用〕
次に、ＥＣＵ１０（排気絞り弁３８の制御装置）の作用として、ＥＣＵ１０により行われる排気絞り弁３８の制御方法について、詳細に説明する。 [Operation of exhaust throttle valve control device]
Next, as a function of the ECU 10 (control device for the exhaust throttle valve 38), a method for controlling the exhaust throttle valve 38 performed by the ECU 10 will be described in detail.

なお、本実施例では、排気絞り弁３８を開弁する制御として、図２に示すように、通常開弁制御と徐開弁制御と急開弁制御が存在する。ここで、通常開弁制御とは、排気絞り弁３８を図２に示すような所定の通常速度で開弁する制御である。また、徐開弁制御とは、図２に示すように、前記の通常開弁制御における所定の通常速度よりも遅い徐開速度により排気絞り弁３８を開弁する制御である。さらに、急開弁制御とは、図２に示すように、前記の通常開弁制御における所定の通常速度よりも速い急開速度により排気絞り弁３８を開弁する制御である。   In this embodiment, as the control for opening the exhaust throttle valve 38, there are a normal valve opening control, a slow valve opening control, and a rapid valve opening control as shown in FIG. Here, the normal valve opening control is control for opening the exhaust throttle valve 38 at a predetermined normal speed as shown in FIG. Further, the gradual valve opening control is a control for opening the exhaust throttle valve 38 at a gradual opening speed slower than a predetermined normal speed in the normal valve opening control as shown in FIG. Further, the rapid valve opening control is a control for opening the exhaust throttle valve 38 at a rapid opening speed faster than a predetermined normal speed in the normal valve opening control as shown in FIG.

また、排気絞り弁３８の開弁速度は、モータへの入力電圧や入力電流により制御する。例えば、入力電圧について、通常開弁制御のときは１２Ｖとし、徐開弁制御のときは１０Ｖとし、急開弁制御のときは１４Ｖとすることが考えられる。また、排気絞り弁３８の開度の目標値をなまし処理してもよい。このとき、例えば、なまし量について、通常開弁制御のときは中とし、徐開弁制御のときは大とし、急開弁制御のときは小とすることが考えられる。   The valve opening speed of the exhaust throttle valve 38 is controlled by the input voltage or input current to the motor. For example, the input voltage may be 12V for normal valve opening control, 10V for gradual valve opening control, and 14V for rapid valve opening control. Further, the target value of the opening degree of the exhaust throttle valve 38 may be smoothed. At this time, for example, it is conceivable that the smoothing amount is set to medium during normal valve opening control, large during slow valve opening control, and small during rapid valve opening control.

本実施例において、ＥＣＵ１０は、図３に示す排気絞り弁全閉学習制御ルーチンを所定時間毎に周期的に実行する。   In this embodiment, the ECU 10 periodically executes the exhaust throttle valve full-close learning control routine shown in FIG. 3 at predetermined time intervals.

そこで、図３に示すルーチンの処理が開始されると、まず、ＥＣＵ１０は、実排気絞り弁開度ｔｔｅｘと、アクセル開度ｔａａｃｃと、エンジン回転数Ｎｅを取り込む（ステップＳ１）。ここで、実排気絞り弁開度ｔｔｅｘとは、弁開度センサ４４からＥＣＵ１０に入力される排気絞り弁３８の実際の開度である。   Therefore, when the processing of the routine shown in FIG. 3 is started, first, the ECU 10 takes in the actual exhaust throttle valve opening degree ttex, the accelerator opening degree taacc, and the engine speed Ne (step S1). Here, the actual exhaust throttle valve opening tex is the actual opening of the exhaust throttle valve 38 input from the valve opening sensor 44 to the ECU 10.

次に、ＥＣＵ１０は、アクセル開度ｔａａｃｃとエンジン回転数Ｎｅより目標排気絞り弁開度ｔｅｘ（排気絞り弁３８の目標開度）を求める（ステップＳ２）。このとき、例えば、図４に示すようなマップを使用する。   Next, the ECU 10 obtains a target exhaust throttle valve opening degree tex (target opening degree of the exhaust throttle valve 38) from the accelerator opening degree taacc and the engine speed Ne (step S2). At this time, for example, a map as shown in FIG. 4 is used.

次に、ＥＣＵ１０は、アクセル開度センサ４０からのアクセル踏込量をもとに、アクセル開度ｔａａｃｃが０％であるか否かを判定する（ステップＳ３）。   Next, the ECU 10 determines whether or not the accelerator opening degree taacc is 0% based on the accelerator depression amount from the accelerator opening degree sensor 40 (step S3).

そして、アクセル開度ｔａａｃｃが０％である場合には、ＥＣＵ１０は、フューエルカット（Ｆ／Ｃ）中であるか否かを判定する（ステップＳ４）。ここでフェールカットとは、エンジン２２の運転時において噴射弁からの燃料噴射が一時停止されることである。   When the accelerator opening degree taacc is 0%, the ECU 10 determines whether or not the fuel cut (F / C) is being performed (step S4). Here, the fail cut is that the fuel injection from the injection valve is temporarily stopped during the operation of the engine 22.

そして、フューエルカット中である場合には、ＥＣＵ１０は、回転数センサ４２からのエンジン回転数Ｎｅをもとに、エンジン回転数Ｎｅが１５００ｒｐｍ未満か否かを判定する（ステップＳ５）。   When the fuel cut is in progress, the ECU 10 determines whether or not the engine rotational speed Ne is less than 1500 rpm based on the engine rotational speed Ne from the rotational speed sensor 42 (step S5).

そして、エンジン回転数Ｎｅが１５００ｒｐｍ未満の場合には、ＥＣＵ１０は、エンジン回転数Ｎｅが１０００ｒｐｍよりも高いか否かを判定する（ステップＳ６）。   If the engine speed Ne is less than 1500 rpm, the ECU 10 determines whether or not the engine speed Ne is higher than 1000 rpm (step S6).

そして、エンジン回転数Ｎｅが１０００ｒｐｍよりも高い場合、すなわち、エンジン回転数Ｎｅが１０００ｒｐｍよりも高く１５００ｒｐｍ未満である場合には、ＥＣＵ１０は、全閉学習実行完了フラグＸＥｘ．Ｖ＿ｃｌｏｓｅが「０」であるか否かを判定する（ステップＳ７）。   When the engine speed Ne is higher than 1000 rpm, that is, when the engine speed Ne is higher than 1000 rpm and lower than 1500 rpm, the ECU 10 sets the fully closed learning execution completion flag XEx. It is determined whether or not V_close is “0” (step S7).

そして、全閉学習実行完了フラグＸＥｘ．Ｖ＿ｃｌｏｓｅが「０」である場合には、ＥＣＵ１０は、全閉学習の開始であるか否かを判定する（ステップＳ８）。ここで、「全閉学習の開始であるか否か」とは、全閉学習の開始前であってこれから全閉学習を開始する場合に該当するか否か、ということである。   Then, the fully closed learning execution completion flag XEx. When V_close is “0”, the ECU 10 determines whether or not the fully closed learning is started (step S8). Here, “whether or not it is the start of fully closed learning” refers to whether or not it corresponds to the case of starting fully closed learning before the start of fully closed learning.

そして、全閉学習の開始である場合には、ＥＣＵ１０は、排気絞り弁３８を所定の通常速度で全閉に制御し（ステップＳ９）、全閉学習を開始して、その後の処理を一旦終了する。一方、全閉学習の開始でない場合には、ＥＣＵ１０は、排気絞り弁３８が全閉である状態を継続し（ステップＳ１０）、全閉学習を継続して、その後の処理を一旦終了する。   If it is the start of the fully closed learning, the ECU 10 controls the exhaust throttle valve 38 to be fully closed at a predetermined normal speed (step S9), starts the fully closed learning, and once ends the subsequent processing. To do. On the other hand, when it is not the start of the fully closed learning, the ECU 10 continues the state in which the exhaust throttle valve 38 is fully closed (step S10), continues the fully closed learning, and once terminates the subsequent processing.

このように、ＥＣＵ１０は、アクセル開度ｔａａｃｃが０％であり、かつ、エンジン２２にてフューエルカットが行われ、かつ、エンジン回転数Ｎｅが所定の範囲内（ここでは例えば、エンジン回転数Ｎｅが１０００ｒｐｍよりも高く１５００ｒｐｍ未満である範囲内）である条件を満たすときに、排気絞り弁３８を強制的に全閉して排気絞り弁３８の全閉位置を学習する全閉学習を行う。   Thus, the ECU 10 has the accelerator opening degree taacc of 0%, the fuel cut is performed by the engine 22, and the engine speed Ne is within a predetermined range (for example, the engine speed Ne is, for example, When the condition of (in the range higher than 1000 rpm and lower than 1500 rpm) is satisfied, full closing learning is performed in which the exhaust throttle valve 38 is forcibly fully closed to learn the fully closed position of the exhaust throttle valve 38.

また、図３に示すように、ステップＳ３でアクセル開度ｔａａｃｃが０％でない場合には、ＥＣＵ１０は、全閉学習からの加速に該当するか否かを判定する（ステップＳ１１）。ここで、「全閉学習からの加速に該当するか否か」とは、全閉学習中に運転者がアクセルペダル（不図示）を踏み込んでアクセル開度ｔａａｃｃが増加し車両が加速したか否か、ということである。   Further, as shown in FIG. 3, when the accelerator opening degree taacc is not 0% in step S3, the ECU 10 determines whether or not the acceleration from the fully closed learning is applicable (step S11). Here, “whether or not it corresponds to acceleration from fully-closed learning” means whether or not the driver depresses an accelerator pedal (not shown) during fully-closed learning and the accelerator opening degree taacc increases to accelerate the vehicle. Or that.

そして、全閉学習からの加速に該当する場合には、ＥＣＵ１０は、実排気絞り弁開度ｔｔｅｘが目標排気絞り弁開度ｔｅｘよりも小さいか否かを判定する（ステップＳ１２）。そして、実排気絞り弁開度ｔｔｅｘが目標排気絞り弁開度ｔｅｘよりも小さい場合には、ＥＣＵ１０は、排気絞り弁３８を急開速度で目標排気絞り弁開度ｔｅｘに制御し（ステップＳ１３）、すなわち、排気絞り弁３８について目標排気絞り弁開度ｔｅｘまで急開弁制御を実行し、その後の処理を一旦終了する。   If the acceleration corresponds to the learning from the fully closed learning, the ECU 10 determines whether or not the actual exhaust throttle valve opening degree tex is smaller than the target exhaust throttle valve opening degree tex (step S12). When the actual exhaust throttle valve opening degree tex is smaller than the target exhaust throttle valve opening degree tex, the ECU 10 controls the exhaust throttle valve 38 to the target exhaust throttle valve opening degree tex at a rapid opening speed (step S13). That is, the rapid opening control is executed for the exhaust throttle valve 38 to the target exhaust throttle valve opening degree tex, and the subsequent processing is temporarily ended.

一方、ステップＳ１２で実排気絞り弁開度ｔｔｅｘが目標排気絞り弁開度ｔｅｘ以上の場合には、ＥＣＵ１０は、急開弁制御を完了して急開弁制御フラグＸ＿ｔｅｘｈを「１」とし（ステップＳ１４）、その後の処理を一旦終了する。   On the other hand, if the actual exhaust throttle valve opening tex is greater than or equal to the target exhaust throttle valve opening tex in step S12, the ECU 10 completes the rapid valve control and sets the rapid valve control flag X_texh to “1” (step S12). S14), and the subsequent processing is temporarily ended.

また、図３に示すように、ステップＳ１１で全閉学習からの加速に該当しない場合には、ＥＣＵ１０は、急開弁制御フラグＸ＿ｔｅｘｈが「０」であるか否かを判定する（ステップＳ１５）。そして、急開弁制御フラグＸ＿ｔｅｘｈが「０」である場合には、ＥＣＵ１０は、その後の処理を一旦終了する。一方、急開弁制御フラグＸ＿ｔｅｘｈが「１」である場合には、ＥＣＵ１０は、通常の排気絞り弁制御を継続し（ステップＳ１６）、その後の処理を一旦終了する。なお、通常の排気絞り弁制御については、後述する。   As shown in FIG. 3, when the acceleration from the fully closed learning is not satisfied in step S11, the ECU 10 determines whether or not the rapid valve control flag X_texh is “0” (step S15). . When the rapid valve control flag X_texh is “0”, the ECU 10 once terminates the subsequent processing. On the other hand, when the rapid opening control flag X_texh is “1”, the ECU 10 continues the normal exhaust throttle valve control (step S16), and temporarily terminates the subsequent processing. Normal exhaust throttle valve control will be described later.

また、図３に示すように、ステップＳ４でフューエルカット中でない場合、または、ステップＳ５でエンジン回転数Ｎｅが１５００ｒｐｍ以上の場合には、ＥＣＵ１０は、全閉学習中であるか否かを判定する（ステップＳ１７）。そして、全閉学習中である場合には、ＥＣＵ１０は、排気絞り弁３８を徐開速度で目標排気絞り弁開度ｔｅｘに制御し（ステップＳ１８）、その後の処理を一旦終了する。一方、全閉学習中でない場合には、ＥＣＵ１０は、通常の排気絞り弁制御を継続し（ステップＳ１６）、その後の処理を一旦終了する。   Further, as shown in FIG. 3, when the fuel cut is not being performed in step S4 or when the engine speed Ne is 1500 rpm or more in step S5, the ECU 10 determines whether or not the fully closed learning is being performed. (Step S17). When the fully closed learning is being performed, the ECU 10 controls the exhaust throttle valve 38 to the target exhaust throttle valve opening degree tex at a gradual opening speed (step S18), and the subsequent processing is temporarily ended. On the other hand, when the fully closed learning is not being performed, the ECU 10 continues the normal exhaust throttle valve control (step S16), and the subsequent processing is temporarily ended.

また、図３に示すように、ステップＳ６でエンジン回転数Ｎｅが１０００ｒｐｍ以下である場合には、ＥＣＵ１０は、エンジン回転数Ｎｅが７００ｒｐｍよりも高いか否かを判定する（ステップＳ１９）。なお、エンジン回転数Ｎｅが７００ｒｐｍのときとは、例えば、車両が停止してエンジン２２がアイドリング状態にあるときに相当する。   As shown in FIG. 3, when the engine speed Ne is 1000 rpm or less in step S6, the ECU 10 determines whether or not the engine speed Ne is higher than 700 rpm (step S19). The case where the engine speed Ne is 700 rpm corresponds to, for example, when the vehicle is stopped and the engine 22 is in an idling state.

そして、エンジン回転数Ｎｅが７００ｒｐｍよりも高い場合、すなわち、エンジン回転数Ｎｅが７００ｒｐｍよりも高く１０００ｒｐｍ以下である場合には、ＥＣＵ１０は、全閉開弁復帰徐開制御フラグＸＥｘ．Ｖ＿ｏｐｅｎが「０」であるか否かを判定する（ステップＳ２０）。そして、全閉開弁復帰徐開制御フラグＸＥｘ．Ｖ＿ｏｐｅｎが「０」である場合には、ＥＣＵ１０は、排気絞り弁３８を徐開速度で目標排気絞り弁開度ｔｅｘに制御し（ステップＳ１８）、その後の処理を一旦終了する。一方、全閉開弁復帰徐開制御フラグＸＥｘ．Ｖ＿ｏｐｅｎが「１」である場合には、ＥＣＵ１０は、通常の排気絞り弁制御を継続し（ステップＳ１６）、その後の処理を一旦終了する。   When the engine speed Ne is higher than 700 rpm, that is, when the engine speed Ne is higher than 700 rpm and equal to or lower than 1000 rpm, the ECU 10 sets the fully-closed valve return return gradual opening control flag XEx. It is determined whether or not V_open is “0” (step S20). Then, the fully-closed valve opening return gradual opening control flag XEx. When V_open is “0”, the ECU 10 controls the exhaust throttle valve 38 to the target exhaust throttle valve opening degree tex at the slow opening speed (step S18), and then terminates the subsequent processing. On the other hand, the fully-closed valve return return gradual opening control flag XEx. When V_open is “1”, the ECU 10 continues the normal exhaust throttle valve control (step S16), and the subsequent processing is temporarily ended.

また、図３に示すように、ステップＳ１９でエンジン回転数Ｎｅが７００ｒｐｍ以下の場合には、ＥＣＵ１０は、フューエルカットを復帰（終了）させて（ステップＳ２１）、前記のステップＳ１２に移行する。   As shown in FIG. 3, when the engine speed Ne is 700 rpm or less in step S19, the ECU 10 returns (ends) the fuel cut (step S21), and proceeds to step S12.

また、図３に示すように、ステップＳ７で全閉学習実行完了フラグＸＥｘ．Ｖ＿ｃｌｏｓｅが「１」である場合には、ＥＣＵ１０は、前記のステップＳ２０に移行する。   Further, as shown in FIG. 3, the fully closed learning execution completion flag XEx. If V_close is “1”, the ECU 10 proceeds to step S20.

以上が図３に示すルーチンの説明である。   The above is the description of the routine shown in FIG.

ここで、ＥＣＵ１０は、前記の通常の排気絞り弁制御においては、図５に示す通常の排気絞り弁制御ルーチンを所定時間毎に周期的に実行する。   Here, in the normal exhaust throttle valve control, the ECU 10 periodically executes a normal exhaust throttle valve control routine shown in FIG. 5 every predetermined time.

そこで、図５に示すルーチンの処理が開始されると、まず、ＥＣＵ１０は、実排気絞り弁開度ｔｔｅｘと、アクセル開度ｔａａｃｃと、エンジン回転数Ｎｅとを取り込む（ステップＳ１０１）。   Therefore, when the processing of the routine shown in FIG. 5 is started, first, the ECU 10 takes in the actual exhaust throttle valve opening degree ttex, the accelerator opening degree taacc, and the engine speed Ne (step S101).

次に、ＥＣＵ１０は、アクセル開度ｔａａｃｃとエンジン回転数Ｎｅより目標排気絞り弁開度ｔｅｘを求める（ステップＳ１０２）。ここでは、例えば、前記の図４に示すようなマップを使用する。   Next, the ECU 10 obtains a target exhaust throttle valve opening degree tex from the accelerator opening degree taacc and the engine speed Ne (step S102). Here, for example, the map as shown in FIG. 4 is used.

次に、ＥＣＵ１０は、実排気絞り弁開度ｔｔｅｘが目標排気絞り弁開度ｔｅｘよりも小さいか否かを判定する（ステップＳ１０３）。そして、実排気絞り弁開度ｔｔｅｘが目標排気絞り弁開度ｔｅｘよりも小さい場合には、ＥＣＵ１０は、排気絞り弁３８について所定の通常速度で開弁制御を実行し（ステップＳ１０４）、すなわち、前記の通常開弁制御を行い、その後の処理を一旦終了する。一方、実排気絞り弁開度ｔｔｅｘが目標排気絞り弁開度ｔｅｘよりも大きい場合には、ＥＣＵ１０は、排気絞り弁３８について所定の通常速度で閉弁制御を実行し（ステップＳ１０５）、その後の処理を一旦終了する。   Next, the ECU 10 determines whether or not the actual exhaust throttle valve opening degree tex is smaller than the target exhaust throttle valve opening degree tex (step S103). When the actual exhaust throttle valve opening degree tex is smaller than the target exhaust throttle valve opening degree tex, the ECU 10 executes the valve opening control at a predetermined normal speed for the exhaust throttle valve 38 (step S104), that is, The normal valve opening control is performed, and the subsequent processing is temporarily terminated. On the other hand, when the actual exhaust throttle valve opening degree tex is larger than the target exhaust throttle valve opening degree tex, the ECU 10 executes the valve closing control at a predetermined normal speed for the exhaust throttle valve 38 (step S105). The process is temporarily terminated.

以上が図５に示すルーチンの説明である。   The above is the description of the routine shown in FIG.

ここで、エンジン回転数Ｎｅと、アクセル開度ｔａａｃｃと、フューエルカットのＯＮ・ＯＦＦと、排気絞り弁３８の開度と、全閉開弁復帰徐開制御フラグＸＥｘ．Ｖ＿ｏｐｅｎのタイムチャートの一例を、図６に示す。   Here, the engine speed Ne, the accelerator opening degree taacc, the fuel cut ON / OFF, the opening degree of the exhaust throttle valve 38, and the fully closed valve opening return gradual opening control flag XEx. An example of a time chart of V_open is shown in FIG.

まず、アクセル開度ｔａａｃｃが０％になると、ＥＣＵ１０は、排気絞り弁３８を前記の図４のマップにて規定されたアクセル開度ｔａａｃｃが０％のときの目標開度αに制御する（図６中の領域ａ）。その後、フューエルカットが行われ、エンジン回転数Ｎｅが１５００ｒｐｍよりも低くなると、ＥＣＵ１０は、排気絞り弁３８を所定の通常速度で全閉に制御する（図６中の領域ｂ）。そして、ＥＣＵ１０は、排気絞り弁３８を全閉にすると、排気絞り弁３８の全閉学習を開始する。このように、ＥＣＵ１０は、アクセル開度ｔａａｃｃが０％であり、かつ、フューエルカットが行われ、かつ、エンジン回転数Ｎｅが１５００ｒｐｍよりも低くなる条件を満たすときに、排気絞り弁３８を強制的に全閉して排気絞り弁３８の全閉位置を学習する全閉学習を行う。   First, when the accelerator opening degree taacc becomes 0%, the ECU 10 controls the exhaust throttle valve 38 to the target opening degree α when the accelerator opening degree taacc defined by the map of FIG. 4 is 0% (FIG. 4). Region a) in FIG. Thereafter, fuel cut is performed, and when the engine speed Ne becomes lower than 1500 rpm, the ECU 10 controls the exhaust throttle valve 38 to be fully closed at a predetermined normal speed (region b in FIG. 6). Then, when the exhaust throttle valve 38 is fully closed, the ECU 10 starts learning to fully close the exhaust throttle valve 38. Thus, the ECU 10 forces the exhaust throttle valve 38 when the accelerator opening degree taacc is 0%, fuel cut is performed, and the engine speed Ne is lower than 1500 rpm. Fully closed learning is performed in which the fully closed position of the exhaust throttle valve 38 is learned.

その後、全閉学習中に、例えば車両が下り坂に達するなどしてエンジン回転数Ｎｅが１５００ｒｐｍ以上になったとする。すると、ＥＣＵ１０は、排気絞り弁３８について徐開速度で開弁制御を行って、排気絞り弁３８を前記の図４にて規定されたアクセル開度ｔａａｃｃが０％のときの目標開度αに制御する（図６中の領域ｃ）。このように、ＥＣＵ１０は、全閉学習の途中でエンジン回転数Ｎｅが１５００ｒｐｍ以上になったことにより全閉学習を中断したときは、全閉学習を中断した後に、徐開弁制御を行って、排気絞り弁３８をアクセル開度ｔａａｃｃが０％のときの目標開度αに制御する。   After that, during the fully closed learning, it is assumed that the engine rotational speed Ne becomes 1500 rpm or more due to, for example, the vehicle reaching a downhill. Then, the ECU 10 controls the exhaust throttle valve 38 at a gradual opening speed so that the exhaust throttle valve 38 is set to the target opening degree α when the accelerator opening degree taacc defined in FIG. 4 is 0%. Control is performed (region c in FIG. 6). Thus, when the engine speed Ne is interrupted due to the engine speed Ne being 1500 rpm or more during the fully closed learning, the ECU 10 performs the slow valve control after interrupting the fully closed learning. The exhaust throttle valve 38 is controlled to the target opening degree α when the accelerator opening degree taacc is 0%.

その後、エンジン回転数Ｎｅが再び１５００ｒｐｍよりも低くなると、ＥＣＵ１０は、気絞り弁３８を所定の通常速度で全閉に制御する（図６中の領域ｄ）。そして、ＥＣＵ１０は、排気絞り弁３８を全閉にすると、再び排気絞り弁３８の全閉学習を開始する。   Thereafter, when the engine speed Ne again becomes lower than 1500 rpm, the ECU 10 controls the air throttle valve 38 to be fully closed at a predetermined normal speed (region d in FIG. 6). When the exhaust throttle valve 38 is fully closed, the ECU 10 starts learning to fully close the exhaust throttle valve 38 again.

そして、ＥＣＵ１０は、排気絞り弁３８の全閉学習を継続して所定時間（図６における時間Ａ）を経過した後、全閉開弁復帰徐開制御フラグＸＥｘ．Ｖ＿ｏｐｅｎをＯＮ（「１」）として、排気絞り弁３８を徐開速度で前記の図４にて規定されたアクセル開度ｔａａｃｃが０％のときの目標開度αに制御する（図６中の領域ｅ）。このように、ＥＣＵ１０は、全閉学習を完了した後に、徐開弁制御を行って、排気絞り弁３８をアクセル開度ｔａａｃｃが０％のときの目標開度αまで開弁する。   Then, the ECU 10 continues the fully closed learning of the exhaust throttle valve 38 and, after a predetermined time (time A in FIG. 6) has elapsed, the fully closed valve return return gradually opening control flag XEx. V_open is set to ON (“1”), and the exhaust throttle valve 38 is controlled to the target opening α when the accelerator opening taacc defined in FIG. 4 is 0% at the slow opening speed (in FIG. 6). Region e). Thus, after completing the fully closed learning, the ECU 10 performs the gradual valve opening control to open the exhaust throttle valve 38 to the target opening α when the accelerator opening degree taacc is 0%.

その後、アクセルペダルが踏み込まれてアクセル開度ｔａａｃｃが増加すると、ＥＣＵ１０は、フューエルカットを終了して、前記の通常開弁制御を行って、排気絞り弁３８を所定の通常速度でアクセル開度ｔａａｃｃに応じて前記の図４に示すように規定される目標排気絞り弁開度ｔｅｘに制御する（図６中の領域ｆ）。なお、図６中の領域ｇでは、ＥＣＵ１０は、通常の排気絞り弁制御を行っている。   Thereafter, when the accelerator pedal is depressed and the accelerator opening degree taacc increases, the ECU 10 ends the fuel cut, performs the normal valve opening control, and sets the exhaust throttle valve 38 at a predetermined normal speed. Accordingly, the target exhaust throttle valve opening degree tex defined as shown in FIG. 4 is controlled (region f in FIG. 6). In the region g in FIG. 6, the ECU 10 performs normal exhaust throttle valve control.

以上が図６に示すタイムチャートの説明である。   The above is the description of the time chart shown in FIG.

また、エンジン回転数Ｎｅと、アクセル開度ｔａａｃｃと、フューエルカットのＯＮ・ＯＦＦと、排気絞り弁３８の開度と、全閉開弁復帰徐開制御フラグＸＥｘ．Ｖ＿ｏｐｅｎのタイムチャートの他の例を、図７に示す。図７では、前記の全閉学習からの加速に該当する場合のタイムチャートの一例を示している。   Further, the engine speed Ne, the accelerator opening degree taacc, the fuel cut ON / OFF, the opening degree of the exhaust throttle valve 38, and the fully closed valve opening return slow opening control flag XEx. Another example of the V_open time chart is shown in FIG. FIG. 7 shows an example of a time chart in the case of the acceleration from the fully closed learning.

図７に示す例においては、前記の図６に示す例と異なる点として、全閉学習中にアクセルペダルが踏み込まれてアクセル開度ｔａａｃｃが増加する場合に、すなわち、全閉学習中に車両が加速する場合に、ＥＣＵ１０は、フューエルカットを終了し、全閉学習を中断して、排気絞り弁３８を急開速度で前記の図４に規定するアクセル開度ｔａａｃｃに応じた目標排気絞り弁開度ｔｅｘに制御する（図７中の領域ｅ）。そして、その後、ＥＣＵ１０は、排気絞り弁３８を所定の通常速度で前記の図４に規定するアクセル開度ｔａａｃｃに応じた目標排気絞り弁開度ｔｅｘに制御する（図７中の領域ｆ）。   In the example shown in FIG. 7, the difference from the example shown in FIG. 6 is that when the accelerator pedal is depressed during the fully closed learning and the accelerator opening degree taacc increases, that is, the vehicle is in the fully closed learning. When accelerating, the ECU 10 ends the fuel cut, interrupts the fully closed learning, and opens the target exhaust throttle valve according to the accelerator opening degree taacc defined in FIG. 4 at a rapid opening speed. The degree is controlled to tex (region e in FIG. 7). Thereafter, the ECU 10 controls the exhaust throttle valve 38 at a predetermined normal speed to a target exhaust throttle valve opening degree tex corresponding to the accelerator opening degree taacc defined in FIG. 4 (region f in FIG. 7).

このように、ＥＣＵ１０は、全閉学習の途中でアクセル開度ｔａａｃｃが増加したことによりフューエルカットを終了して全閉学習を中断したときは、全閉学習を中断した後に、徐開弁制御を行わずに、急開弁制御を行って排気絞り弁３８をアクセル開度ｔａａｃｃに応じた目標排気絞り弁開度ｔｅｘまで開弁する。なお、このように、急開弁制御を行うが、運転者は車両を加速したいという意識があり、エンジン２２が発する音も大きくなるので、排気絞り弁３８を急開速度で開弁することにより発生する圧力開放音に運転者などは違和感を覚えず問題にならない。   As described above, when the fuel cut is terminated and the fully closed learning is interrupted due to the increase of the accelerator opening degree taacc during the fully closed learning, the ECU 10 performs the gradually opening valve control after interrupting the fully closed learning. Instead, rapid opening control is performed to open the exhaust throttle valve 38 to the target exhaust throttle valve opening degree tex corresponding to the accelerator opening degree taacc. Although the quick valve opening control is performed as described above, the driver is conscious of accelerating the vehicle and the sound generated by the engine 22 is increased. Therefore, by opening the exhaust throttle valve 38 at the rapid opening speed, The driver does not feel uncomfortable with the generated pressure release sound and does not matter.

以上が図７に示すタイムチャートの説明である。   The above is the description of the time chart shown in FIG.

さらに、エンジン回転数Ｎｅと、アクセル開度ｔａａｃｃと、フューエルカットのＯＮ・ＯＦＦと、排気絞り弁３８の開度と、全閉開弁復帰徐開制御フラグＸＥｘ．Ｖ＿ｏｐｅｎのタイムチャートの他の例を、図８に示す。図８では、全閉学習中にエンジン回転数Ｎｅが低下した場合のタイムチャートの一例を示している。   Further, the engine speed Ne, the accelerator opening degree taacc, the fuel cut ON / OFF, the opening degree of the exhaust throttle valve 38, and the fully closed valve opening return slow opening control flag XEx. Another example of the time chart of V_open is shown in FIG. FIG. 8 shows an example of a time chart when the engine speed Ne decreases during the fully closed learning.

図８に示す例においては、前記の図６に示す例と異なる点として、全閉学習中にエンジン回転数Ｎｅが１０００ｒｐｍ以下に低下したときに、全閉学習を中断して排気絞り弁３８を徐開速度で前記の図４に規定するアクセル開度ｔａａｃｃが０％のときの目標開度αに制御する（図８中の領域ｅ）。そして、排気絞り弁３８の開度が目標開度αになったときに、フューエルカットを終了する。このように、ＥＣＵ１０は、全閉学習の途中でエンジン回転数Ｎｅが１０００ｒｐｍ以下に低下したことにより全閉学習を中断したときは、全閉学習を中断した後に、徐開弁制御を行って、排気絞り弁３８をアクセル開度ｔａａｃｃが０％のときの目標開度αまで開弁する。   In the example shown in FIG. 8, the difference from the example shown in FIG. 6 is that when the engine speed Ne decreases to 1000 rpm or less during the fully closed learning, the fully closed learning is interrupted and the exhaust throttle valve 38 is set. Control is performed to the target opening degree α when the accelerator opening degree taacc defined in FIG. 4 is 0% at the slow opening speed (region e in FIG. 8). When the opening of the exhaust throttle valve 38 reaches the target opening α, the fuel cut is terminated. In this way, when the engine speed Ne is interrupted because the engine speed Ne has decreased to 1000 rpm or less during the fully closed learning, the ECU 10 performs the gradual opening valve control after interrupting the fully closed learning, The exhaust throttle valve 38 is opened to the target opening degree α when the accelerator opening degree taacc is 0%.

また、図８に示す例においては、全閉学習の途中でエンジン回転数Ｎｅが急低下して７００ｒｐｍ以下になったときに、フューエルカットを終了して、全閉学習を中断し、排気絞り弁３８を急開速度で前記の図４に規定するアクセル開度ｔａａｃｃが０％のときの目標開度αに制御する（図８中の領域ｆ）。このように、ＥＣＵ１０は、全閉学習の途中でエンジン回転数Ｎｅが低下して所定の範囲外（ここでは、エンジン回転数Ｎｅが１０００ｒｐｍよりも高く１５００ｒｐｍ未満である範囲外）における所定の回転数以下（ここでは、例えば、７００ｒｐｍ以下）になったことによりフューエルカットを終了して全閉学習を中断したときは、全閉学習を中断した後に、徐開弁制御を行わずに、急開弁制御を行って排気絞り弁３８をアクセル開度ｔａａｃｃに応じた目標排気絞り弁開度ｔｅｘまで開弁する。   In the example shown in FIG. 8, when the engine speed Ne suddenly decreases to 700 rpm or less during the fully closed learning, the fuel cut is terminated, the fully closed learning is interrupted, and the exhaust throttle valve is stopped. 38 is controlled to the target opening degree α when the accelerator opening degree taacc specified in FIG. 4 is 0% at a rapid opening speed (region f in FIG. 8). In this way, the ECU 10 decreases the engine speed Ne during the fully closed learning and falls outside the predetermined range (here, the engine speed Ne is outside the range where the engine speed Ne is higher than 1000 rpm and lower than 1500 rpm). When the fuel cut is terminated and the fully closed learning is interrupted due to the following (here, for example, 700 rpm or less), the rapid opening valve is not performed after the fully closed learning is interrupted without performing the slow valve control. By performing control, the exhaust throttle valve 38 is opened to the target exhaust throttle valve opening degree tex corresponding to the accelerator opening degree taacc.

以上が図８に示すタイムチャートの説明である。   The above is the description of the time chart shown in FIG.

〔本実施例の効果〕
以上のような本実施例のＥＣＵ１０（排気絞り弁３８の制御装置）によれば、エンジン２２の運転時に排気絞り弁３８の全閉学習を行うので、排気絞り弁３８の開閉弁を行うモータの作動音は、エンジン２２が発する音またはロードノイズなどにより打ち消される。そのため、運転者などが排気絞り弁３８の開閉弁を行うモータの作動音による違和感を覚えることなく、排気絞り弁３８の全閉学習を行うことができる。 [Effect of this embodiment]
According to the ECU 10 (control apparatus for the exhaust throttle valve 38) of the present embodiment as described above, since the exhaust throttle valve 38 is fully closed during operation of the engine 22, the motor that opens and closes the exhaust throttle valve 38 is operated. The operating sound is canceled out by a sound generated by the engine 22 or road noise. Therefore, the driver or the like can learn to fully close the exhaust throttle valve 38 without feeling uncomfortable due to the operating sound of the motor that opens and closes the exhaust throttle valve 38.

また、ＥＣＵ１０は、車両のアクセル開度ｔａａｃｃが０％であり、かつ、フューエルカットが行われ、かつ、エンジン回転数Ｎｅが所定の範囲内である条件下にて排気絞り弁３８の全閉学習を行うので、吸入空気量を抑制して、背圧の上昇を抑制できる。そのため、エンジン２２における燃焼状態が不安定になることを防ぎ、エンストを防止できる。   Further, the ECU 10 learns that the exhaust throttle valve 38 is fully closed under the condition that the accelerator opening degree taacc of the vehicle is 0%, fuel cut is performed, and the engine speed Ne is within a predetermined range. Therefore, the amount of intake air can be suppressed and the increase in back pressure can be suppressed. Therefore, the combustion state in the engine 22 can be prevented from becoming unstable, and engine stall can be prevented.

また、ＥＣＵ１０は、全閉学習を完了した後や全閉学習を中断した後に、排気絞り弁３８を速度を遅くして開弁するので、排気絞り弁３８の圧力開放音を抑制できる。そのため、全閉学習を完了した後や全閉学習を中断した後に、運転者などが排気絞り弁３８の圧力開放音による違和感を覚えることがない。特に、ディーゼルエンジンの場合には、ガソリンエンジンのスロットルバルブに相当するものがない。そのため、ディーゼルエンジンの場合には、アクセル開度ｔａａｃｃが０％であっても排気絞り弁３８を全閉すると背圧が大きく上昇してしまうが、排気絞り弁３８を速度を遅くして開弁することにより排気絞り弁３８の圧力開放音を抑制できる。   Further, since the ECU 10 opens the exhaust throttle valve 38 at a reduced speed after completing the full-close learning or after interrupting the full-close learning, the pressure release sound of the exhaust throttle valve 38 can be suppressed. Therefore, after completing the fully closed learning or interrupting the fully closed learning, the driver or the like does not feel uncomfortable due to the pressure release sound of the exhaust throttle valve 38. In particular, in the case of a diesel engine, there is no equivalent to a throttle valve of a gasoline engine. Therefore, in the case of a diesel engine, even if the accelerator opening degree taacc is 0%, if the exhaust throttle valve 38 is fully closed, the back pressure increases greatly. However, the exhaust throttle valve 38 is opened at a slower speed. By doing so, the pressure release sound of the exhaust throttle valve 38 can be suppressed.

また、ＥＣＵ１０は、全閉学習の途中でフューエルカットが終了されたとき、または、全閉学習の途中でエンジン回転数Ｎｅが所定の範囲外となったときに、全閉学習を中断する。これにより、背圧の上昇を抑制できる。   Further, the ECU 10 interrupts the fully closed learning when the fuel cut is finished in the middle of the fully closed learning or when the engine speed Ne is outside the predetermined range during the fully closed learning. Thereby, the raise of a back pressure can be suppressed.

また、ＥＣＵ１０は、徐開弁制御を行って排気絞り弁３８をアクセル開度ｔａａｃｃが０％のときの目標開度αに制御した後、通常速度により排気絞り弁３８を開弁する通常開弁制御を行って排気絞り弁３８をアクセル開度ｔａａｃｃに応じた目標排気絞り弁開度ｔｅｘに制御する。これにより、圧力開放音を抑制しながら排気絞り弁３８を開弁した後、排気絞り弁３８をアクセル開度ｔａａｃｃに応じて規定される目標排気絞り弁開度ｔｅｘまで確実に開弁することができる。そのため、排気絞り弁３８の圧力開放音の違和感を解消しながら、運転者の意思に沿った車両の走行を行うことができる。   Further, the ECU 10 performs the slow opening valve control to control the exhaust throttle valve 38 to the target opening degree α when the accelerator opening degree taacc is 0%, and then opens the exhaust throttle valve 38 at a normal speed. By performing control, the exhaust throttle valve 38 is controlled to the target exhaust throttle valve opening degree tex corresponding to the accelerator opening degree taacc. Thus, after the exhaust throttle valve 38 is opened while suppressing the pressure release noise, the exhaust throttle valve 38 can be reliably opened to the target exhaust throttle valve opening degree tex defined according to the accelerator opening degree taacc. it can. Therefore, the vehicle can be driven in accordance with the driver's intention while eliminating the uncomfortable feeling of the pressure release sound of the exhaust throttle valve 38.

また、ＥＣＵ１０は、全閉学習の途中でアクセル開度ｔａａｃｃが増加したことによりフューエルカットが終了されて全閉学習を中断したとき、または、全閉学習の途中でエンジン回転数Ｎｅが急低下して所定の範囲外における所定の回転数以下（例えば、７００ｒｐｍ以下）になったことにより全閉学習を中断したときは、全閉学習を中断した後に、徐開弁制御を行わずに、急開弁制御を行って排気絞り弁３８をアクセル開度ｔａａｃｃに応じた目標排気絞り弁開度ｔｅｘに制御する。これにより、車両が急加速するときに背圧が急激に上昇することを抑制でき、エンストを防止できる。また、エンジン回転数Ｎｅが急低下するときにも、エンストを防止できる。   Further, the ECU 10 suddenly decreases the engine speed Ne when the fuel cut is terminated due to an increase in the accelerator opening degree taacc during the fully closed learning and the fully closed learning is interrupted, or during the fully closed learning. When the fully closed learning is interrupted due to the rotation speed being less than the predetermined rotation speed outside the predetermined range (for example, 700 rpm or less), after the fully closed learning is interrupted, the valve is suddenly opened without performing the gradual opening valve control. By performing valve control, the exhaust throttle valve 38 is controlled to the target exhaust throttle valve opening degree tex corresponding to the accelerator opening degree taacc. Thereby, when a vehicle accelerates rapidly, it can suppress that a back pressure raises rapidly, and an engine stall can be prevented. Also, engine stall can be prevented when the engine speed Ne suddenly decreases.

なお、上記した実施の形態は単なる例示にすぎず、本発明を何ら限定するものではなく、その要旨を逸脱しない範囲内で種々の改良、変形が可能であることはもちろんである。例えば、図１においてはエンジンシステム１としてディーゼルエンジンシステムを示したが、これに限定されず、ガソリンエンジンシステムにおいて本発明の排気絞り弁３８の制御装置および制御方法を適用してもよい。また、前記において、全閉学習を行うときの条件の１つとしてエンジン回転数Ｎｅが１０００ｒｐｍよりも高く１５００ｒｐｍ未満である範囲内であることを一例として挙げたが、エンジン回転数Ｎｅの条件はこの範囲に特に限定されない。   It should be noted that the above-described embodiment is merely an example and does not limit the present invention in any way, and various improvements and modifications can be made without departing from the scope of the invention. For example, although a diesel engine system is shown as the engine system 1 in FIG. 1, the present invention is not limited to this, and the control device and control method for the exhaust throttle valve 38 of the present invention may be applied to a gasoline engine system. In the above description, one example of the conditions for performing the fully closed learning is that the engine speed Ne is within a range higher than 1000 rpm and lower than 1500 rpm. The condition for the engine speed Ne is as follows. The range is not particularly limited.

１ エンジンシステム
１０ ＥＣＵ
１４ 吸気通路
１６ 過給機
２２ エンジン
２４ 排気通路
３４ ＬＰＬ−ＥＧＲシステム
３８ 排気絞り弁
５０ ＥＧＲ通路
５２ ＥＧＲクーラ
５４ ＥＧＲバルブ
ｔｔｅｘ 実排気絞り弁開度
ｔａａｃｃ アクセル開度
Ｎｅ エンジン回転数
ｔｅｘ 目標排気絞り弁開度
ＸＥｘ．Ｖ＿ｃｌｏｓｅ 全閉学習実行完了フラグ
Ｘ＿ｔｅｘｈ 急開弁制御フラグ
ＸＥｘ．Ｖ＿ｏｐｅｎ 全閉開弁復帰徐開制御フラグ 1 Engine system 10 ECU
14 intake passage 16 supercharger 22 engine 24 exhaust passage 34 LPL-EGR system 38 exhaust throttle valve 50 EGR passage 52 EGR cooler 54 EGR valve tex actual exhaust throttle valve opening taacc accelerator opening Ne engine speed tex target exhaust throttle valve Opening XEx. V_close Fully closed learning execution completion flag X_texh Rapid valve opening control flag XEx. V_open Fully closed valve open return slow open control flag

Claims (6)

内燃機関に接続する排気通路に設けられ開弁状態にて所定の通常速度で開閉弁して排気の流れを制限する排気絞り弁の制御装置において、
前記内燃機関を搭載する車両のアクセル開度が０％であり、かつ、前記内燃機関にてフューエルカットが行われ、かつ、前記内燃機関の回転数が所定の範囲内である条件を満たすときに、前記排気絞り弁を強制的に全閉して前記排気絞り弁の全閉位置を学習する全閉学習を行う全閉学習制御手段を有し、
前記全閉学習制御手段は、前記全閉学習を完了した後に、前記通常速度よりも遅い徐開速度により前記排気絞り弁を開弁する徐開弁制御を行って前記排気絞り弁を前記アクセル開度が０％のときの目標開度に制御すること、
を特徴とする排気絞り弁の制御装置。 In a control device for an exhaust throttle valve that is provided in an exhaust passage connected to an internal combustion engine and opens and closes at a predetermined normal speed in a valve-open state to restrict the flow of exhaust gas,
When the accelerator opening of the vehicle on which the internal combustion engine is mounted is 0%, fuel cut is performed in the internal combustion engine, and the rotational speed of the internal combustion engine is within a predetermined range. , have a fully closed learning control means for fully closing learning for learning the fully closed position of the forced fully closed by the exhaust throttle valve the exhaust throttle valve,
The full-close learning control means performs a slow-open valve control that opens the exhaust throttle valve at a slow opening speed slower than the normal speed after completing the full-close learning, thereby opening the accelerator throttle valve. Control to the target opening when the degree is 0%,
An exhaust throttle valve control device. 請求項１の排気絞り弁の制御装置において、
前記全閉学習制御手段は、前記全閉学習の途中で前記フューエルカットが終了されたとき、または、前記全閉学習の途中で前記内燃機関の回転数が前記所定の範囲外となったときに、前記全閉学習を中断すること、
を特徴とする排気絞り弁の制御装置。 In the exhaust throttle valve control device according to claim 1 ,
The full-close learning control means is configured such that when the fuel cut is completed during the full-close learning, or when the rotational speed of the internal combustion engine is out of the predetermined range during the full-close learning. Interrupting the fully closed learning,
An exhaust throttle valve control device. 請求項１または２の排気絞り弁の制御装置において、
前記全閉学習制御手段は、前記全閉学習を中断した後に、前記通常速度よりも遅い徐開速度により前記排気絞り弁を開弁する徐開弁制御を行って前記排気絞り弁を前記アクセル開度が０％のときの目標開度に制御すること、
を特徴とする排気絞り弁の制御装置。 The exhaust throttle valve control device according to claim 1 or 2 ,
The full-close learning control means performs a slow-open valve control that opens the exhaust throttle valve at a slow opening speed slower than the normal speed after interrupting the full-close learning, thereby opening the accelerator throttle valve. Control to the target opening when the degree is 0%,
An exhaust throttle valve control device. 請求項１乃至３のいずれか１つの排気絞り弁の制御装置において、
前記全閉学習制御手段は、前記徐開弁制御を行って前記排気絞り弁を前記アクセル開度が０％のときの目標開度に制御した後、前記通常速度により前記排気絞り弁を開弁する通常開弁制御を行って前記排気絞り弁を前記アクセル開度に応じた目標開度に制御すること、
を特徴とする排気絞り弁の制御装置。 In the control device of the exhaust throttle valve according to any one of claims 1 to 3 ,
The fully-closed learning control means performs the gradual opening control to control the exhaust throttle valve to a target opening when the accelerator opening is 0%, and then opens the exhaust throttle valve at the normal speed. Performing normal valve opening control to control the exhaust throttle valve to a target opening according to the accelerator opening;
An exhaust throttle valve control device. 請求項２の排気絞り弁の制御装置において、
前記全閉学習制御手段は、前記全閉学習の途中で前記アクセル開度が増加したことにより前記フューエルカットが終了されて前記全閉学習を中断したとき、または、前記全閉学習の途中で前記内燃機関の回転数が前記所定の範囲外に低下して、前記所定の範囲外における所定の回転数以下になったことにより前記全閉学習を中断したときは、前記全閉学習を中断した後に、前記通常速度よりも速い急開速度により前記排気絞り弁を開弁する急開弁制御を行って前記排気絞り弁を前記アクセル開度に応じた目標開度に制御すること、
を特徴とする排気絞り弁の制御装置。 In the exhaust throttle valve control device according to claim 2 ,
The full-closed learning control means, when the fuel cut is terminated due to an increase in the accelerator opening during the full-closed learning and the full-closed learning is interrupted, or during the full-closed learning When the fully closed learning is interrupted because the rotational speed of the internal combustion engine has fallen outside the predetermined range and has become equal to or less than the predetermined rotational speed outside the predetermined range, Performing the rapid opening valve control for opening the exhaust throttle valve at a rapid opening speed faster than the normal speed to control the exhaust throttle valve to a target opening degree according to the accelerator opening degree;
An exhaust throttle valve control device. 内燃機関に接続する排気通路に設けられ開弁状態にて所定の通常速度で開閉弁して排気の流れを制限する排気絞り弁の制御方法において、
前記内燃機関を搭載する車両のアクセル開度が０％であり、かつ、前記内燃機関にてフューエルカットが行われ、かつ、前記内燃機関の回転数が所定の範囲内である条件を満たすときに、前記排気絞り弁を強制的に全閉して前記排気絞り弁の全閉位置を学習する全閉学習を行い、
前記全閉学習を完了した後に、前記通常速度よりも遅い徐開速度により前記排気絞り弁を開弁する徐開弁制御を行って前記排気絞り弁を前記アクセル開度が０％のときの目標開度に制御すること、
を特徴とする排気絞り弁の制御方法。 In a control method of an exhaust throttle valve that is provided in an exhaust passage connected to an internal combustion engine and opens and closes at a predetermined normal speed in a valve open state to restrict the flow of exhaust,
When the accelerator opening of the vehicle on which the internal combustion engine is mounted is 0%, fuel cut is performed in the internal combustion engine, and the rotational speed of the internal combustion engine is within a predetermined range. , have rows fully closed learning for learning the fully closed position of the forced fully closed by the exhaust throttle valve the exhaust throttle valve,
After the completion of the full-close learning, a slow opening control is performed to open the exhaust throttle valve at a slow opening speed slower than the normal speed, and the exhaust throttle valve is set to a target when the accelerator opening is 0%. To control the opening,
An exhaust throttle valve control method characterized by the above.
JP2012147018A 2012-06-29 2012-06-29 Exhaust throttle valve control device and exhaust throttle valve control method Expired - Fee Related JP5847030B2 (en)

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